+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1906 Naef (1972 RC) Classification: Main-belt Asteroid          SPK-ID: 2001906 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .13412507742887 1.9478e-08   a 2.373770732973422 5.5388e-09 au q 2.055388549614976 4.724e-08 au i 6.471741361792468 2.2513e-07 deg node 354.7465383418399 9.6471e-06 deg peri 14.73941431253639 1.2858e-05 deg M 58.04842068836606 6.1987e-06 deg tp 2458985.100599102196 (2020-May-15.60059910) 2.276e-05 TDB period 1335.846581244725 3.66 4.6755e-06 1.28e-08 d yr n .2694920247986536 9.4323e-10 deg/d Q 2.692152916331868 6.2817e-09 au   Orbit Determination Parameters    # obs. used (total)      3012      data-arc span      20203 days (55.31 yr)      first obs. used      1965-11-20      last obs. used      2021-03-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40019      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 13:05:48   Additional Information  Earth MOID = 1.0535 au   Jupiter MOID = 2.7722 au   T_jup = 3.522  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.57   n/a E2021B10   diameter diameter 7.923 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 11.009 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2005) http://www.asu.cas.cz/~ppravec/neo.htm] [Durkee, R.I.; Pravec, P. (2007) Minor Planet Bull. 34, 49.] [Polishook, D. (2010) Minor Planet Bull. 37, 65-69.] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] [Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.234   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1906 Naef (1972 RC)          Discovered 1972-Sep-05 by Wild, P. at Zimmerwald Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1972 RC = 1943 VF = 1952 DG1 = 1965 WF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 00:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin